GA4 + Google Ads: link them without corrupting your conversions

What this integration unlocks

• Audience sharing from GA4 behavior into Google Ads for targeting and exclusion, once Google Signals or user-provided data collection is on
• Richer reporting, with Google Ads cost and click data alongside GA4 behavior
• The option to create Google Ads conversions from GA4 key events
• Cross-device and cross-session context the ad tag alone misses
• A second measurement lens to validate the ad platform's own numbers

Setup steps

1. 1

   Link the GA4 property to Google Ads

   In GA4, go to Admin > Product links > Google Ads links and link the account. You need the Editor or Administrator role on the GA4 property and administrative access to the Google Ads account. Personalized advertising is on by default in the link, and you can enable auto-tagging during the flow. The link brings Google Ads cost and click data into GA4 reporting.

   The link itself is low-risk and worth doing. The decisions that matter come next, around conversions, so link first and hold off on importing any conversions until you have chosen your source of truth.

2. 2

   Decide your conversion source of truth first

   This is the decision that makes or breaks the setup. You can count conversions via the Google Ads tag, or import them from GA4, but running both for the same action double-counts and misleads Smart Bidding.

   Decide deliberately: many accounts keep the Google Ads tag, or server-side conversions, as the source of truth for bidding because of attribution differences, and use GA4 for analysis. Whatever you choose, one action should have one authoritative conversion source feeding bidding, not two.

3. 3

   Configure conversions consistently

   GA4 now calls its tracked goals key events. Only an event marked as a key event in GA4 (Admin > Data display > Events) can become a Google Ads conversion: in Google Ads, go to Goals > Summary > Create conversion action and pick the GA4 property and event. Data can take up to 24 hours to appear. So the choice below is between that imported conversion and the Google Ads tag. Once you have chosen a source of truth, configure accordingly. If you import GA4 conversions for bidding, do not also count the same action via the Google Ads tag, and vice versa. Check the conversions table for duplicate actions counting the same event, and check the counting setting (Every or One), which changes the reported numbers.

   Be aware GA4 and Google Ads attribute differently, GA4's default and the ad platform's models can disagree, so a GA4-imported conversion will not always match what the tag reported. Pick the lens you trust for bidding and stay consistent.

4. 4

   Share GA4 audiences into Google Ads

   The safest, highest-value use of the link is audiences. Remarketing audiences need Google Signals or user-provided data collection turned on for the GA4 property. Build GA4 audiences from behavior, engaged users, cart abandoners, high-value browsers, and share them to Google Ads for targeting and, importantly, exclusion.

   These behavioral audiences are richer than the ad platform can build alone. Use them to retarget intent and to exclude existing customers or converters from prospecting, which sharpens targeting without touching the conversion-counting decision at all.

5. 5

   Use GA4 to validate, not replace, platform numbers

   Keep GA4 as a second lens to sanity-check the ad platform's self-reported performance. When Google Ads reports a conversion volume or ROAS that looks inflated, GA4 and your backend are where you validate it.

   The goal is not to make the two tools agree, they use different attribution and never fully will, but to use the disagreement as a signal. A large, unexplained gap between GA4 and Google Ads is worth investigating before you trust either number for a budget decision.

Common issues

Common questions